Barry's Introduction to Construction of Buildings by Stephen Emmitt

Author:Stephen Emmitt
Language: eng
Format: epub, pdf
ISBN: 9781118977217
Publisher: John Wiley & Sons, Inc.
Published: 2018-10-22T00:00:00+00:00

6.5 Thermal insulation to pitched roofs

There are two approaches to insulating pitched roofs: constructing either a ‘cold roof’ or a ‘warm roof’, as described later.

Cold roof

The most convenient, economical and usual place for insulation in a pitched roof is either across the top of, or between, the ceiling joists to create a cold roof construction. The disadvantage of spreading or laying mineral fibre insulation or insulation boards between ceiling joists is that there will be a great deal of wasteful cutting in fitting the material closely between joists. Therefore, rolls of insulation (such as fibreglass, rockwool or sheep’s wool) are laid between the joists, or loose fill (such as cellulose fibre products) is spread between the joists. Where insulation is fixed between joists, an allowance for the different thermal conductivity of wood should be made.

The most straightforward way of providing a layer of insulation is to spread rolls of mineral fibre across the top of ceiling joists right across ceilings in both directions and extended up to and overlapping insulation in walls, as illustrated in Figure 6.50. To ensure that the layer of insulation is continuous over the whole of the ceiling area, it is recommended that loft hatches (illustrated in Figure 6.51), giving access to roof spaces, be insulated and draught‐sealed, and that, where service pipes penetrate ceiling finishes, some effective form of draught seal be formed. All water‐carrying service pipes, water storage cisterns or tanks inside cold roof spaces must be effectively protected with insulating material (lagging) against the possibility of damage from the water freezing.

Figure 6.50 Cold roof: continuous insulation across ceiling.

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